(21b-8)-5(4b+3)=-7

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Solution for (21b-8)-5(4b+3)=-7 equation:


Simplifying
(21b + -8) + -5(4b + 3) = -7

Reorder the terms:
(-8 + 21b) + -5(4b + 3) = -7

Remove parenthesis around (-8 + 21b)
-8 + 21b + -5(4b + 3) = -7

Reorder the terms:
-8 + 21b + -5(3 + 4b) = -7
-8 + 21b + (3 * -5 + 4b * -5) = -7
-8 + 21b + (-15 + -20b) = -7

Reorder the terms:
-8 + -15 + 21b + -20b = -7

Combine like terms: -8 + -15 = -23
-23 + 21b + -20b = -7

Combine like terms: 21b + -20b = 1b
-23 + 1b = -7

Solving
-23 + 1b = -7

Solving for variable 'b'.

Move all terms containing b to the left, all other terms to the right.

Add '23' to each side of the equation.
-23 + 23 + 1b = -7 + 23

Combine like terms: -23 + 23 = 0
0 + 1b = -7 + 23
1b = -7 + 23

Combine like terms: -7 + 23 = 16
1b = 16

Divide each side by '1'.
b = 16

Simplifying
b = 16

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